Reputation bot

This improved version of @furion's bot
You will need:
Python3: https://www.python.org/downloads/
Piston: http://piston.readthedocs.io/en/develop/installation.html

I'm using pm2 to restart bot when it crashes.
Here is process.json for pm2:

{
  "apps" : [{
    "name"            : "bot",
    "script"          : "./bot.py",
    "watch"           : true,
    "interpreter"     : "/usr/local/bin/python3",
    "interpreter_args": "-u"
  }]
}

Here is bot. Copy this code to file named: bot.py
Edit ACCOUNT and POSTING_KEY constants.

from piston.steem import BroadcastingError
import threading
import time
from datetime import datetime
import random
from pprint import pprint

ACCOUNT = "<account>"
POSTING_KEY = "<posting key in wif format>"
VOTE_DELAY = 1770 # 29 minutes and 30 seconds
VOTE_WEIGHT = 100
MIN_REPUTATION = 7462599456169 # about 59 rep on steemit
# MIN_REPUTATION = 10046968152082 # about 61 rep on steemit


comment_history = {}

def feed():
    print("Waiting for new posts with high reputation")
    steem = Steem(wif=POSTING_KEY, node="wss://node.steem.ws")

    for comment in steem.stream_comments():
        if int(comment.author_reputation) < MIN_REPUTATION:
            continue
        # Comments don't have titles. This is how we can know if we have a post or a comment.
        if len(comment.title) == 0:
            continue
        # check if we already upvoted this. Sometimes the feed will give duplicates.
        if comment.identifier in comment_history:
            continue
        # exclude updates to posts
        if comment.created_parsed != comment.last_update_parsed:
            continue

        comment_history[comment.identifier] = True
        print("[%s][NEW POST] %s" % (time_now(), url_builder(comment)))
        workerThread = threading.Thread(name=comment.identifier, target=worker, args=(comment,))
        workerThread.start()


def url_builder(comment):
    return "https://steemit.com/%s/%s" % (comment.category, comment.identifier)

def time_now():
    now = datetime.now()
    return now.strftime("%d.%m.%Y %H:%M:%S")

def worker(worker_comment):
     time.sleep(VOTE_DELAY)
     try:
        worker_comment.vote(VOTE_WEIGHT, ACCOUNT)
        comment_history.pop(worker_comment.identifier, None)
        print("[%s][UPVOTED] %s" % (time_now(), url_builder(worker_comment)) )
     except BroadcastingError as e:
        print("[%s][UPVOTE FAILED] %s" % (time_now(), url_builder(worker_comment)) )
        print(str(e))

if __name__ == "__main__":
    while True:
        try:
            feed()
        except (KeyboardInterrupt, SystemExit):
            print("\nQuitting...")
            break
        except Exception as e:
            traceback.print_exc()
            print("### Exception Occurred: Restarting...")

Starting bot using pm2:
pm2 start process.json
Without pm2:
python3 bot.py